New suggestion to the main panel

Hi, I love eM Client and I would like to make a suggest to improove the apearance and usability.
I have many accouts in my message panel on the left side. And in each account I have many folders and sub-folders.
It would be great if we could highlight with colors tha name account and each main folder created.
Otherwise it´s a little difficult to distinguish the accounts and main folders.
Congratulations and thanks for all the great job and software!

Best regards,
Bruno Leite